Is this diatom vs a type of Cyano?

sofi112

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Tank is 4 months old - notice this orange-brown film on everything including aquarium glass. Was on the sand bed but went away a couple of days ago. Completed my weekly water change today

C6F2DF5C-D4D1-4235-B893-2018446DA1B2.jpeg
 

Tahoe61

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Really hard to make out id.

I imagine that at 4 months it is probably a mix of both.
 

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